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CVE-2026-103923— KaTeX: Existing prototype pollution can bypass trust restrictions

Quick assessment

Affected
KaTeX KaTeX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

KaTeX 是一个快速且易于使用的 JavaScript 库，用于在 Web 上渲染 TeX 数学公式。从版本 0.11.0 到 0.18.2，KaTeX 对渲染器选项对象、信任设置（trust setting）、默认及处理器配置元数据，以及命名空间查找和组恢复操作，均使用普通的 JavaScript 属性访问方式。这种实现方式会导致继承的属性被误认为是显式提供的值。 如果 已被污染，或者攻击者能够控制选项对象的原型，那么由攻击者控制的数学表达式可以利用继承的 值来启用“可信渲染”（trusted renderin

CVSS 2.1 · Low EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
KaTeX KaTeX >= 0.11.0, < 0.18.2 affected
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I. Basic Information for CVE-2026-103923

Vulnerability Information
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Vulnerability Title
KaTeX: Existing prototype pollution can bypass trust restrictions
Source: CVE Program / CVE List V5
Vulnerability Description
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. From 0.11.0 until 0.18.2, KaTeX uses ordinary JavaScript property access for the renderer options object, the trust setting, default and processor setting metadata, and namespace lookup and group restoration, allowing inherited properties to be treated as explicitly supplied values. When Object.prototype is already polluted or an attacker controls the options object's prototype, attacker-controlled mathematical expressions can use an inherited trust value to enable trusted rendering and produce links capable of user-interaction cross-site scripting or loading attacker-selected external resources in a consuming application that inserts unsanitized KaTeX output into a page. KaTeX does not itself create the prototype pollution, and rendering an expression alone does not execute script. This issue is fixed in version 0.18.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在安全决策中依赖未经信任的输入
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
KaTeX KaTeX >= 0.11.0, < 0.18.2 -

II. Public POCs for CVE-2026-103923

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III. Intelligence Information for CVE-2026-103923

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Patches & Fixes for CVE-2026-103923 (2)

Vendor Advisories for CVE-2026-103923 (1)

Vendor Pages for CVE-2026-103923 (1)

IV. Related Vulnerabilities

Same product: KaTeX
Same vendor: KaTeX
Same weakness: CWE-807

V. Comments for CVE-2026-103923

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